5. When there is just pure action and no story what-so-ever. Yeah it's entertaining in some cases, especially as an anime than a manga. I don't want the book to take me less than 10 minutes to read and the rest if full pages of fighting and grunting.
4. When it just gets too friggin long... unless the story is really that good. My attention span usually can't last to even close to 50 volumes.
3. When the characters are just tooooooo damn annoying. stfu
2. When my favorite character dies!!! That's just cruel!
1. If it's just plain ole boring. If I fall asleep half way or less through the book I think it's best that I drop it.

1. If it is a romance and the two characters finally get together and become a couple. Once commitment comes in, its no fun.
2. Bad and/or cheesy characters.
3. Constant flashbacks (ex. Naruto)
4. tons of fillers to the point you forgot what the main plot is.
5. Doesn't have a good hook in the beginning

5. Weak, cry baby females and wimpy guys in the story (ESPECIALLY if they're the main characters) make me leave.
4. Typical things that happen (especially in shoujo/rom-com mangas). For example, guy and girl are doing great then the guy's childhood friend that's a girl comes to school and tries to break the main couple up, car accident and the guy gets amnesia, girl goes to bad boy, etc.
3. Story moves along so slowly.
2. The story is confusing.
1. The art doesn't really suit my taste.

5. Never gets to the point or advances in plot
4. Starts getting stupid
3. If they stop printing the states...like loveless i now have to read it online which i hate so i get rly behind on everything
2. Seems to repeat the same things (like when the bad guy keeps getting way...like rly?)
1. Gets boring for me -.-

5. if too much sweetness and nudity between the characters that while reading im getting puke.
4. to much mystery that even the writer do not know how to solve it
3. the plot does not advancing. that just keeping around the bush
2. when the girl/boy fell in love with a nowhere character in the story
1. when one or both of the characters (I loved) died in the middle of the story!

5 when the mangaka runs out of ideas and just jumble up a ch
4 when you can see the ending a mile away
3 when it change the plot and story a total makeover if you must
2 when the good guy spare the bad guy
1 when the good guy have a sudden change of heart in love/hating someone and make a total life change